Periodic fringe imaging with structured pattern illumination and electronic rolling shutter detection

摘要

The present invention relates to a method of obtaining multiple images with a spatially varying periodic fringe pattern produced by a digital light projector that is spatially and temporally synchronized to the rolling shutter exposure of a two-dimensional pixel array detector. Two or more images obtained with phase-shifted spatial fringe patterns are combined to form a composite image with the spatial fringes and other unwanted scattered light removed.

主权项

1. A method for digital imaging, the method comprising the steps of:
operating a digital light projector to produce two or more linear illumination patterns having a pre-defined illumination pattern duty cycle that is less than 100%; directing light from the two or more produced linear illumination patterns onto a target; directing light from the target to a two dimensional pixel array detector having a rolling shutter exposure functionality and a pre-defined exposure time; using a timing signal to control a spatial-temporal relationship between the rolling shutter exposure of the two dimensional pixel array detector and the two or more produced linear illumination patterns; detecting a first image having a periodic variation in spatial intensity by setting the exposure time of the two dimensional pixel array detector to less than ten times an illumination pattern period; adjusting a spatial-temporal relationship between the rolling shutter exposure of the pixel array detector and the two or more produced linear illumination patterns to detect one or more additional images having a change in at least one of an amplitude, frequency, or phase of a periodic variation in spatial intensity with respect to the first image; and combining the first image and the one or more additional images to create a composite image.